iRacing is expensive, I'll admit, but since going to it after umming and ahhing for THREE YEARS, everything else feels awful to me. I'd definitely recommend it.
I've got some iRacing videos on my YouTube channel.
www.youtube.com/user/Chazlington1992/It's good enough to make you forget about everything else. I'll admit the only reason I'm still playing Speed Dreams is the customisation is beautiful - hence my upcoming GT3 Series that I'll be doing, and covering on YouTube and so on.
After playing iRacing, it becomes apparent that ...
GRID makes every car handle like a Formula 1 car.
Forza is under-steer city.
Need For Speed - no.
Test Drive is like driving while balancing an ostrich on your bonnet.
I haven't tried Project CARS or Assetto Corsa, but rFactor does it for me in terms of physics, and iRacing's community is second to none.